US2677253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cooling oxygen circulating device
Assignee: Individual
•
Filing: 1951-10-11
•
Granted: 1954-05-04
•
Expires: 1971-10-11
Abstract
No abstract record available.
Inventors
- 👤 Lee Randolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:05
CPC Classifications
A; A61; A61G; A61G10/00; A61G10/04; A61M; A61M2205/00; A61M2205/36; A61M2205/3606
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2159741A
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US2162860A
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US2104589A
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US2190613A
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US2210458A
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US2212239A
Cited
US2166813A
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US2310843A
Cited
US2502263A
Cited
US2581709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-03 | 1957-11-02 | 1958-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-03 | 1961-11-02 | 1962-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-03 | 1965-11-02 | 1966-05-04 | $7700.00 | Window Closed / Lapsed |